How to customise Bootstrap 4 SCSS variables using angular-cli & ng-bootstrap?
The accepted answer no longer works. If you are like me you are a new angular user trying to add bootstrap to your project and following the angular-cli wiki here: https://github.com/angular/angular-cli/wiki/stories-include-bootstrap (as pasted in the accepted answer).
The problem is discussed here:https://github.com/twbs/bootstrap/issues/23112
Short version: The theme colors are now in a nested object so things like $brand-primary no longer apply - we must now change $theme-colors. It works, but we now have to replace the entire object even if we only want to edit one variable.
$gray-100: #f8f9fa;$gray-600: #868e96;$gray-800: #343a40;$red: #dc3545;$yellow: #ffc107;$green: #006600; // This is the only variable I wanted to change$cyan: #17a2b8;$theme-colors: ( primary: $green, secondary: $gray-600, success: $green, info: $cyan, warning: $yellow, danger: $red, light: $gray-100, dark: $gray-800);
Angular CLI stories gives an answer at https://github.com/angular/angular-cli/wiki/stories-include-bootstrap which I will summarise below. Note that I am yet to find out how this interacts with ng-bootstrap
.
Create a project:
ng new my-app --style=scsscd my-app
Install Bootstrap 4:
npm install bootstrap@next --save
Configuring Project
Create an empty file _variables.scss
in src/
which is where your style modifications will go.
In styles.scss
add the following:
@import 'variables';@import '../node_modules/bootstrap/scss/bootstrap';
Testing Project
Open app.component.html and add the following markup:
<button class="btn btn-primary">Test Button</button>
With the application configured, run ng serve
to run your application in develop mode. In your browser navigate to the application localhost:4200
.
Verify the bootstrap styled button appears. To ensure your variables are used open _variables.scss
and add the following:
$brand-primary: red;
Return the browser to see the font colour changed.
It took me a while to work out so, in hope it helps someone, these are the steps I took to create my own custom style that overrides ng-bootstrap
.
- Create an Angular project using
scss
for the style (not .sass!) - Install ng-bootstrap using
ng add
as detailed in the installation section (notnpm install
).
This added a line in my styles.scss
file like so:
/* Importing Bootstrap SCSS file. */@import '~bootstrap/scss/bootstrap';
- From here, I could add properties above the
@import
which then meant I could change the theme as desired.
As for finding the variables to override, I first found them using a save from boostrap magic, but they could be found directly in node_modules\bootstrap\scss\_variables.scss
Example working styles.scss
with override for the primary color:
/* You can add global styles to this file, and also import other style files */$primaryColor: hotpink; $theme-colors: (primary: $primaryColor);/* Importing Bootstrap SCSS file. */@import '~bootstrap/scss/bootstrap';